12 bisections later ... nothing! I think I got lost in themaze. Bisection #5 had a crash, but it looked to be a verydiffernt crash (and looked to happen later than the bug I washunting). So I marked that as "good" on the theory that itlooked like this bug wasn't in the kernel. Same thing happenedat bisection #9. But I ended up with:

Which just looks too improbable to be the cause of the UPcrash. Git won't revert it out from top of tree automaticallyso I can't easily test whether some weird magic means thatthis is the buggy commit.

Perhaps the issue is another offset of object X in kernel w.r.t.object Y ... and so the good/bad choices in the bisection areactually pretty random depending on how much code is stuffedbetween X & Y at each bisection point.